[README.md] Mention mplayer and mpv in "other programs" question

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -538,7 +538,7 @@ Apparently YouTube requires you to pass a CAPTCHA test if you download too much.
 
 youtube-dl works fine on its own on most sites. However, if you want to convert video/audio, you'll need [avconv](https://libav.org/) or [ffmpeg](https://www.ffmpeg.org/). On some sites - most notably YouTube - videos can be retrieved in a higher quality format without sound. youtube-dl will detect whether avconv/ffmpeg is present and automatically pick the best option.
 
-Some videos or video formats can also be only downloaded when [rtmpdump](https://rtmpdump.mplayerhq.hu/) is installed.
+Videos or video formats streamed via RTMP protocol can only be downloaded when [rtmpdump](https://rtmpdump.mplayerhq.hu/) is installed. Downloading MMS and RTSP videos requires either [mplayer](http://mplayerhq.hu/) or [mpv](https://mpv.io/) to be installed.
 
 ### I have downloaded a video but how can I play it?